US2425095A

US2425095A - Grinding wheel dresser

Info

Publication number: US2425095A
Application number: US637847A
Authority: US
Inventors: Ferdinand J Henkel
Original assignee: LAMINA DIES AND TOOLS Inc
Current assignee: LAMINA DIES AND TOOLS Inc
Priority date: 1945-12-29
Filing date: 1945-12-29
Publication date: 1947-08-05
Anticipated expiration: 1964-08-05

Description

Aug. 5, 1947. F. .LjHNKEL 2,425,095 4` GRINDING WHEEL D RESSER Filed Dec. 29, 1945 2 Sheets-Sheet l l Aug' 5, 1947- F. J. HENKEL 2,425,095

GBINDING WHEEL DRESSER' Filed Dec. 29, 1945 2 Sheets-Sheet 2 Patented ug. 5, 194'? GRINDING WHEEL DRESSER.

lFerdinand J. Henkel, 'Royal-"Oak, Mich., assigner to Lamina Diesand -Tols,-'Inc.,\Berkley,Mich.,

a corporationof Michigan Applicationlecember 29, 1945,4Serial No.\.637,847

-9 Claims. 1 This invention relates Ato grinding machines, and in particular to wheel dressing devices for such-machines.

`One object isto :provide a simple yet accurate grinding wheel dresser whereinthe dressing tool may-be instantly attached or removed merelyby placing'it on a swinging rest carrying a template. Another object is `to provide a grinding wheel dresser wherein the dressing tool lis carried in a-holder which rests upon a baseplate and in contact with ya template as it is pushed manually across the face ofthe grinding wheel.

Another object is to provide a grinding .wheel dresser as set forth in vthe 'preceding objects wherein the rest is moved toward and .awayffrom the grindingwheel byra micrometer screw mechamsm.

'Another object is'to provide a grinding wheel dresser 'as 'set forth in the preceding objects wherein the ,holder carrying Athe ydressing tool .is held in lposition against the rest and likewise against the template by a combination ofgravity and manualforcegthe absence of other mecha'- nism inthe grinding wheel area enabling the rest andV template .to betkept scrupulously clean and to 'be-free from `the errors otherwiseA arising in mechanism exposed t0 the .grit thrown oi bythe grinding wheel being` trued.

-Anotherlobject is to provide aggrinding wheel dresser Yas -set forth in 'the preceding objects wherein the rest Aswings about a pivot shaft 11ocated-above-the'dressing area so that grit thrown off by 'the Vgrinding wheel will never reach the bearings ofthe pivot shaft and hence Ythellatvter will -retain lits l'accuracy of Aadjustment without the Wear otherwise occurring in such devices.

Another yObjectis to provide a grinding machine idresser as setforth in the preceding objects wherein a modified form ofthe invention provides a rest which isinclined to the horizontalin the dressing position of the device.

Other objects and advantages will becomeapparent during the course of the followingdescriptionof the accompanying drawings wherein:

'Figure 1 is a toplplan view of a grinding `wheel dresser .according `to a preferred embodiment of theinvention;

Figure 2 is :a .side elevation, partly in section,

of the grinding .wheeldresser shown 'in Figure 1 Figure-Sisan end elevation ofthe micrometer hand wheel .and adjacent mechanism -in the upperleft-handcorner of Figure i1;

Figure `i is a vertical section taken alongthe brckenline 4 4 n'Figure l;

Figure 5 .is 'a vertical cross-section 'taken along the line 5-5 inEligure 2 'Figure is a horizontal section, partly in top plan view, taken approximately along the `line 6-."6 inFigureZ;

Figure 7 is a .fragmentaryvertical section of the dressingtool block and swinging base plate taken along .the line 'I-ll inFigure 2.; 'and -Fgigure .18 is a side elevation similar to lFigure Zibutshowing a modification vthereof Aemploying an' inclined base plate.

Referring rto 'the drawings jin detai1, Fig ures l aIIdZ show apreferredienibodiment ofthergrinding Vwheel dresse-r of this invention, generally designated l0, as applied to ,a .conventional grinding machine, generally 'designated `Il and havingthe usuaigrindinglhead |12 with. a forwardlynprojecting bearing 'bracket .I3 containing the usual bore 'h1 rotatably Supporting a -shaft l5. Theshaftflisprovided with a flange i6 .having a surface .t1 serving as anabutmentfora grindingwheel 'l 8 mounted upon the reduced diameter portion L9 ofthe shaft l5 andheld imposition by a washer'Z retained' by a nut '2| threaded upon a further reduced diameter portion 22 4which carries .a thread :corresponding to that ofthe,` nut 2|. The grinding vwheel I|.8 Ais provided with the usual peripheralsur'faceZS which is tobe .trued 0I' dressed by thetgrin'ding wheel dresser. I l)v of the present invention.

`The grinding .head I2 is -provided .with a plurality of threaded lholesZA (Figure i) :adaptedto receive boltsZSpassIlgthrough bores 26 inthe base portion I2 of `a 'bracket vi28 (Figure 4) and having a machined rear surface 29 engaging the similarly machined .abutment surface .30 Aof the grindingheadlZ (Figure 1). The base portion-2l of the bracket '28 is approximately .annularin shape and is provided `with .a central aperture 3'lifor thepassage of ,the-bearing-bracket i3, ,A part 32 V( ligure 4) of thebase :poi-tion :.21 is cut away in the direction of a chord ofthe base portion .27 ,and termnates'n astangentiallydisposed arm'33 .extending outwardly from. the base :portion 21.

`'lhe arm 33 of the bracket 28 is provi-ded .with elongated angled guide surfaces l3.5: (Figures .4 and 5) engaging similarly angled surfaces v35 of retaining vplates-36 of a dove-'tailed slide, generally designated A3l. The .dove-.tailed slidel further 'includes a carriageilikeplate khaving threadedfholesl therein adapted to receivebolts passingthrough holes 4lV in the retaining plates 36,-thereby causingthe elements 3.6, '38 and .40 to travel .to and Lfro relatively to the arm 33 along 3 the angled guide surfaces 34 thereof. The bolts 40 also serve to provide an adjustment and takeup for wear in the dove-tailed slide 31 and to maintain the latter in a high precision operating condition.

The slide 31 is moved to and fro along the arm 33 by means of a nut 42 (Figure 6) movable to and fro in an elongated recess 43 in the arm 33 along a screw shaft 44 threaded through the threaded bore 45 of the nut 42. The latter is' approximately T-shaped (Figure 6) and is pro" vided with a shank 46 secured as at 41 in a transverse hole 48 in the plate 38.

The screw shaft 44 is provided with a flanged portion 49 (Figure 6) located in a recess 50 connected to the recess 43 by an enlarged bore 5| so as to permit free rotation thereof. The recess 43 at its opposite end terminates in a cavity 52 adjacent the free end of the screw shaft 44.

Beyond the iianged portion 49, the screw shaft 44 is provided with a reduced diameter portion 53 passing through a corresponding bore 54 in a circular head 55 bolted as at 56 (Figure 3) to the end 51 of the arm 33. The head 55 is provided with a cylindrical boss 58 (Figure 6) which is encircled by the rim 59 of a hand wheel 60 keyed as at 6| to the outer end of the reduced diameter portion 53 of the screw shaft 44. A button 62 additionally serves to retain the hand wheel G upon the end of the screw shaft 44 and secured thereto by the screw 63 threaded into the hole 04. The hand wheel flange 65 is provided with an eccentric threaded hole 66 into which is threaded the end of a knob or handle 61 for rotating the hand wheel 60. The rim 59 is provided with graduations 68 of any suitable dimension, such as in thousandths of an inch. These graduations 98 cooperate with a zero pointer 69 to indicate the travel of the slide 31 and accordingly the feed imparted thereto. The screw shaft 44 is provided With anti-friction thrust bearing assemblies and 1| (Figure 6) on opposite sides of the head 55 and surrounding the reduced diameter portion 53 of the screw shaft 44.

Secured by the bolts 12 passing through holes 'i3 in the plate 38, is a tubular hanger 14 having threaded holes therein (Figure 6) for receiving the ends of the bolts 12. The hanger 14 is provided with a bore 16 (Figure 2) having

annular bearing recesses

11 and 18 at its opposite ends for receiving anti-friction bearing assemblies 19 and 80 respectively. The outer race of the bearing assembly 80 is held in position by a cylindrical cap 8| bolted as at 82 to the hanger 14.

The inner races of the bearing assemblies 19 and 80 are mounted at the opposite ends of the reduced diameter portion 83 of a pivot shaft 84, the lower end of which is threaded as at 85 to receive a retaining nut 86. The upper end of the shaft 84 is enlarged as at 81 to receive a bore 88 in the hub 89 of a swinging arm 90, the shaft 84 being enlarged as at 9| to engage a countersink 92 (Figure 2) in the hub 89. The hanger 14 and shaft 84 are inclined upwardly relatively to the slide 31.

The arm 90 is provided with a plate-like depending portion 93 of roughly triangular shape having a transverse bore 94 (Figures 6 and 7 in which is secured a stop screw 95 having a head 95 engaging the adjacent surface 91 of the slide 31. By this means, thearm 90 is accurately located in a vertical position relatively to the slide 31. Secured to the bottom edge 98 of the depend- 4 img portion 93 of the arm 90 is a plate-like tool rest 99, the connection being made by bolts |00 passing through holes |0| therein into the threaded holes |02 formed in the edge 98'.

The upper surface |03 of the rest 99 is accurately machined to atness and carries a template bar |04 secured thereto as by the bolts |05 threaded into the holes |00 therein. The template bar |04 has secured to a vertical edge thereof a template |01 having an accurate contact surface |08 engaged by the correspondingly accurate front surface |09 of a contact strip ||0 secured to the dressing tool holder in the form of a block (Figure 1). The dressing tool holder has an accurately machined bottom surface ||2 adapted to rest upon and slide along the upper surface |03 of the rest 99. The contact surface |08 of the template |01 may be straight or curved or otherwise configured, depending upon the configuration of the grinding wheel |8, a straight template being shown merely for purposes of illustration.

The tool holder in its front face ||3 is provided with a socket ||4 in which is mounted the shank ||5 (Figure 1) of a diamond dressing tool IIB having a diamond or other extremely hard cutting element ||1 mounted in the forward end thereof. The diamond tool I6 is held in position by the set screw ||8 threaded into the transverse hole ||9 (Figure 1). The parts are so arranged and dimensioned that the diamond ||1 is positioned in alignment with and approximately at the end of a horizontal diameter of the grinding wheel |8.

The modification shown in Figure 8 is similar to the preferred form of the invention shown in Figures l to 'l inclusive, except that the bracket 28 is mounted on the grinding head |2 in an inclined direction such that the rest surface |03 of the rest 99 is inclined to the vertical, thereby causing the tool holder to be similarly inclined, and the diamond ||1 to be aligned with an inclined diameter of the grinding wheel |8. By this construction the tool holder is urged downwardly by gravity against the template |01.

In either form of the invention, when the wheel dresser is not in use and the grinding machine is being used, the tool holder k| is removed from the rest 99 and stored in a safe location. The arm is then swung upwardly around its pivot shaft 84 until it is out of the way, as shown by the chain lines in Figure 8. In the form of the invention shown in Figures 1 to 7 inclusive, the arm 90 will occupy a similar location relatively to the carriage 38 and arm 33, but more nearly horizontal in its position.

In the operation of either form of the invention, when it is desired to dress or true the peripheral surface 23 of the grinding wheel I8, the arm 90 is swung from its raised to its lowered position, as determined by the engagement of the head 96 of the stop screw 95 against the surface 91 of the dove-tailed slide 31. The dress,- ing tool holder is then placed upon the upper surface |03 of the rest 99, which has previously been carefully wiped off, and pushed forward until its contact strip |09 engages the template |01 at a location to one side of the grinding wheel I8. The hand wheel E0 is then turned to move the slide 31 the necessary amount to bring the diamond |1 into close proximity to the grinding wheel surface 23 for a suitable depth of cut. The grinding wheel |8 is then rotated and the tool holder moved along the template |01 While being held firmly in the operators hand, thereby taking a cut across the peripheral surface 23" of the grinding wheel lli. The hand wheel 60 is then moved a prescribed amount according to the graduations 68 with reference to the Zero pointer 69 to move the slide 3l to take the second cut across the periphery 23 of lthe grinding wheel I8. This procedure is repeated until the periphery 23 is suitably trued.

While I have shown and described my invention in detail, it is to be understood that the same is to be limited only by the appended claims, for many changes may be made without departing from the spirit and scope of my invention.

What I claim is:

1. A wheel dresser for grinding machines comprising a support attachable to the grinding machine, a rest connected to said support and extending adjacent said wheel, a template mounted on said rest, a wheel dressing tool holder slidably supported on said rest in engagement with said template, and a wheel dressing tool mounted on said tool holder, said rest being 4'positionable in an inclined arrangement relatively to said wheel, and said tool holder being urged by gravity down said inclined rest into engagement with said template.

2. A wheel dresser for grinding machines comprising a support attachable to the grinding machine, a slide reciprocable on said support, means for precisely moving said slide Itoward and away from said wheel, a rest movably mounted on said slide and extensible into a position adjacent said wheel, a template mounted on said rest, a wheel dressing tool holder slidably supported on said rest in engagement with said template, and a wheel dressing tool mounted on said tool holder.

3. A wheel dresser for grinding machines cornprising a support attachable to the grinding machine, a slide reciprocable on said support, means forl precisely moving said slide toward and away from said wheel, a rest pivotally mounted on said slide and extensible into a position adjacent said wheel, a template mounted on said rest, a wheel dressing tool holder slidably supported on said rest in engagement with said template, and a wheel dressing tool mounted on said tool holder.

4. A wheel dresser for grinding machines comprising a support attachable to Vthe grinding machine, a slide reciprocable on said support, means for precisely moving said slide toward and away from said wheel, a pivot mounting arranged on said slide, a rest connected to said pivot mounting and swingable therearound into and out of proximity to said wheel, a template mounted on said rest, a wheel dressing tool holder slidably supported on said rest in engagement with said template, and a wheel dressing tool mounted on said tool holder.

5. A wheel dresser for grinding machines comprising a support attachable to the grinding machine, a slide reciprocable on said support, means for precisely moving said slide toward and away from said wheel, a pivot mounting arranged on said slide, a rest connected to said pivot mounting and swingable therearound into and out of proximity to said wheel, a template mounted on said rest, a Wheel dressing tool holder slidably suppor-ted on said rest in engagement with said template, and a wheel dressing tool mounted on said tool holder, said pivot mounting having its pivot axis inclined upwardly relatively to said wheel.

6. A wheel dresser for grinding machines comprising a support attachable to the grinding machine, a slide reciprocable on said support, means for precisely moving said slide toward and away from said wheel, a pivot mounting arranged on said slide, a rest connected to said pivot mounting and swingable therearound into and out of proximity to said wheel, a template mounted on said rest, a wheel dressing tool holder slidably supported on said rest in engagement with said template, and a wheel dressing tool mounted on said tool holder, said pivot mounting having its pivot axis inclined upwardly relatively to said wheel and said rest depending therefrom toward said wheel.

7. A Wheel dresser for grinding machines comprising a support attachable to the grinding machine, a slide reciprocable on said support, means for precisely moving said slide toward and away from said wheel, a pivot mounting arranged on said slide, a rest connected to said pivot mounting and swingable therearound into and out o-f proximity to said wheel, a template mounted on said rest, a wheel dressing tool holder slidably supported on said rest in engagement with said template, and a wheel dressing tool mounted on said tool holder, said pivot mounting having its pivot axis inclined upwardly relatively to said wheel and said rest depending therefrom toward said wheel, said rest and said tool holder having relatively flat contacting portions arranged for slidable engagement therebetween.

8. A wheel dresser for grinding machines comprising a support attachable to the grinding machine, a slide reciproca-ble on said support, means for precisely moving said slide toward and away from said wheel, a pivot bearing mounted on said slide, a pivot shaft mounted in said bearing, an arm connected to and depending from said shaft, a rest extending transversely from said arm into proximity to said wheel and having a relatively flat upper surface portion thereon, a template mounted on said rest, a wheel dressing tool holder having a bottom surface slidably engageable with said upper surface portion and with said template, and a wheel dressing tool mounted on said tool holder.

9. A wheel dresser for grinding machines comprising a support .attachable to the grinding machine, a slide reciprocable on said support, means for precisely moving said slide toward and away from said wheel, a pivot bearing mounted on said slide, a pivot shaft mounted in said bearing, an arm connected to and depending from said shaft, a rest extending transversely from said arm into proximity to said wheel and having a relatively flat upper surface portion thereon, a template mounted on said rest, a wheel dressing tool holder having a bottom surface slidably engageable with said upper surface portion and with said template, and a wheel dressing tool mounted on said tool holder, said pivot shaft having its axis inclined upwardly relatively to said slide.

FERDINAND J. HENKEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,324,937 Kropf July 20, 1943 2,137,690 Kropf Nov. 22, 1938 2,351,269 Kropf et al June 13, 1944